Module 19: Number lines-Math 2B - Course Guide

Module Overview:

In this module, students will show how sums can be represented as lengths on a number line and use number lines to solve addition and subtraction word problems. They will also show how differences can be represented as lengths on a number line and create, use, and explain an open number line.

Module Materials:

Lesson # Lesson Title Material(s)
1 Sums Using a Number Line counter
*Math 2B Workbook, ISBN 978-1-63916-123-2 (optional)
2 Solve Word Problems by Adding None
3 Differences Using a Number Line counter;
4 Number Lines None
5 Solve Word Problems by Subtracting None

Module Objectives:

Lesson # Lesson Title Objective(s)
1 Sums Using a Number Line
  1. Show how sums can be represented as lengths on a number line.
2 Solve Word Problems by Adding
  1. Use number lines to solve addition word problems.
3 Differences Using a Number Line
  1. Show how differences can be represented as lengths on a number line.
4 Number Lines
  1. Create, use, and explain an open number line.
5 Solve Word Problems by Subtracting
  1. Use number lines to solve subtraction word problems.

Module Key Words:

Key Words
number line
open number line

Module Assignments:

Lesson # Lesson Title Page # Assignment Title
1 Sums Using a Number Line 4 Hands-On
2 Solve Word Problems by Adding 4 Hands-On
3 Differences Using a Number Line 4 Hands-On
4 Number Lines 4 Hands-On
5 Solve Word Problems by Subtracting 4 Hands-On

Learning Coach Notes:

Lesson # Lesson Title Notes
1 Sums Using a Number Line
2 Solve Word Problems by Adding In their math notebook, have your student write the steps to solving addition word problems using a number line.
3 Differences Using a Number Line Ask your student to show you how to subtract numbers on a number line.
4 Number Lines Ask your student to explain what an open number line is and how they can use it to help them add and subtract.
5 Solve Word Problems by Subtracting In their math notebook, have your student write the steps to solving subtraction word problems using a number line.

Module Guiding Questions:

When a student starts a lesson ask them questions to check for prior knowledge and understanding and to review concepts being taught. At the end of the lesson ask the questions again to see if their answer changes.

Lesson Title Question
Sums Using a Number Line
  1. How do we add on a number line?
Solve Word Problems by Adding
  1. How can we use number lines to solve addition word problems?
Differences Using a Number Line
  1. How do we subtract on a number line?
Number Lines
  1. How do we use number lines to add and subtract?
Solve Word Problems by Subtracting
  1. How can we use number lines to solve subtraction word problems?

Module Video Questions:

When a student watches a video take time to ask them questions about what they watched. Suggested questions for the videos in this module are listed here. Suggestion: Have the student watch the entire video first all the way through. Then have them watch the video a second time, as they watch it pause the video and ask the questions.

Lesson Title Video Question
Sums Using a Number Line Sums Using a Number Line
  1. What is a number line?
  2. How do you add using a number line?
Solve Word Problems by Adding Solve Word Problems by Adding
  1. How can you use a number line to help you solve addition word problems?
Number Lines Open Number Lines
  1. What is an open number line?
  2. How can you use an open number line to help you add and subtract?
Solve Word Problems by Subtracting Solve Word Problems by Subtracting
  1. How can you use a number line to help your solve subtraction word problems?

Module Suggested Read Aloud Books:

Take time to read to your student or have them read aloud to you. Read a different book each day. While reading the book point out concepts being taught. You may purchase these books or find them at your local library. Suggested things to discuss while reading the book:

  • What is the main idea?
  • What are three things new you learned?
  • How does this book relate to what you are learning about?

# Book Author Lexile Level

Module Outing:

Take some time to apply what your student is learning to the real world. Suggested outings are below.

# Outing